| 1 | /* Access functions for JISX0208 conversion. |
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| 2 | Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, write to the Free |
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| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 19 | 02111-1307 USA. */ |
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| 20 | |
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| 21 | #ifndef _JIS0208_H |
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| 22 | #define _JIS0208_H 1 |
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| 23 | |
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| 24 | #include <gconv.h> |
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| 25 | #include <stdint.h> |
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| 26 | |
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| 27 | /* Struct for table with indeces in UCS mapping table. */ |
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| 28 | struct jisx0208_ucs_idx |
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| 29 | { |
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| 30 | uint16_t start; |
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| 31 | uint16_t end; |
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| 32 | uint16_t idx; |
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| 33 | }; |
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| 34 | |
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| 35 | /* Conversion table. */ |
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| 36 | extern const uint16_t __jis0208_to_ucs[]; |
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| 37 | |
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| 38 | extern const char __jisx0208_from_ucs4_lat1[256][2]; |
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| 39 | extern const char __jisx0208_from_ucs4_greek[0xc1][2]; |
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| 40 | extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[]; |
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| 41 | extern const char __jisx0208_from_ucs_tab[][2]; |
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| 42 | |
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| 43 | static inline uint32_t |
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| 44 | jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) |
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| 45 | { |
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| 46 | unsigned char ch = *(*s); |
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| 47 | unsigned char ch2; |
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| 48 | int idx; |
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| 49 | |
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| 50 | if (ch < offset || (ch - offset) <= 0x20) |
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| 51 | return __UNKNOWN_10646_CHAR; |
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| 52 | |
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| 53 | if (avail < 2) |
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| 54 | return 0; |
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| 55 | |
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| 56 | ch2 = (*s)[1]; |
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| 57 | if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
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| 58 | return __UNKNOWN_10646_CHAR; |
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| 59 | |
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| 60 | idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset); |
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| 61 | if (idx >= 0x1e80) |
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| 62 | return __UNKNOWN_10646_CHAR; |
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| 63 | |
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| 64 | (*s) += 2; |
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| 65 | |
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| 66 | return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR); |
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| 67 | } |
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| 68 | |
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| 69 | |
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| 70 | static inline size_t |
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| 71 | ucs4_to_jisx0208 (uint32_t wch, char *s, size_t avail) |
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| 72 | { |
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| 73 | unsigned int ch = (unsigned int) wch; |
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| 74 | const char *cp; |
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| 75 | |
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| 76 | if (avail < 2) |
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| 77 | return 0; |
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| 78 | |
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| 79 | if (ch < 0x100) |
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| 80 | cp = __jisx0208_from_ucs4_lat1[ch]; |
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| 81 | else if (ch >= 0x391 && ch <= 0x451) |
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| 82 | cp = __jisx0208_from_ucs4_greek[ch - 0x391]; |
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| 83 | else |
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| 84 | { |
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| 85 | const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx; |
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| 86 | |
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| 87 | if (ch >= 0xffff) |
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| 88 | return __UNKNOWN_10646_CHAR; |
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| 89 | while (ch > rp->end) |
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| 90 | ++rp; |
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| 91 | if (ch >= rp->start) |
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| 92 | cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start]; |
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| 93 | else |
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| 94 | return __UNKNOWN_10646_CHAR; |
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| 95 | } |
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| 96 | |
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| 97 | if (cp[0] == '\0') |
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| 98 | return __UNKNOWN_10646_CHAR; |
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| 99 | |
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| 100 | s[0] = cp[0]; |
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| 101 | s[1] = cp[1]; |
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| 102 | |
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| 103 | return 2; |
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| 104 | } |
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| 105 | |
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| 106 | #endif /* jis0208.h */ |
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